Strainer



Dc. 12, 1944. F. B. HARVUOT' 2,365,074

' STRAINER 1 I Filed Dec. 31, 1941 4 Sheets-Sheet l Frank B. Harvwoi'INVENTOR.

Dec. 12, 1944. F. B. HARVUOT STRAINER Filed Dec. 31 1941 4 ,SheetsSheet2 Frank B Harvuo? I INVENTOR. BY Wflf/ Dec. 12, 1944. B HARVUQ 2,365,074

STRAINER Filed Dec. 31, 1941 4 Sheets-Sheet 5 I Frank B. HarvuoiINVENTOR.

Patented Dec. 12, 1944 UNITED STATES PATENT OFFICE STRAIN ER lirank B.Harvuot, Fort Wayne, Ind., assignor to S. F. Bowser & Company,Incorporated, Fort -Wayne, Ind., a corporation of Indiana ApplicationDecember 31, 1941, Serial No. 425,171

14 Claims. (CL 210-1 68) means permitting ready access to all of thecompartments.

Still another object of the invention is to provide a readily removablestrainer assembly which can be taken out of the compartment anddismounted, strainer by strainer if necessary, for replacement orcleaning.

These and other objects will become apparent upon further considerationof this specification and the drawings which are attached hereto andmade a part hereof, and in which:

Figure 1 is a section taken on the line I-l of Figure 3, showing thescreen bankand valve opcrating mechanism in elevation.

Figure 2 is .a section taken on the'line 2-2 of Figure 1, showing thescreen compartments and screen banks.

Figure 3 is a section taken on the line 3--3 of Figure 1, showing thevalves and valve operating mechanism. I

Figure 4 is a plan view of one section of a screen bank.

Figure 5 is an end elevation of the screen section of Figure 4 viewedfrom the bottom.

Referring now to Figure '1, the numeral l represents the exterior caseor tank which is provided with flanges 3,5 for connection with companionflanges of a pipe line not shown. The case has a central section whichis in the form of a rectangular parallelepiped and which is surmountedat each en'dby a, frusto pyramid.

Two vertical walls I, 9 are disposed transversely of the case and arewelded to it to divide the case into three longitudinal compartments.A'vertical walll l is disposed longitudinally of the case between Walls1 and '9 and is welded to them. Incorporated in the wall "H is the tubel3 which opens int the end compartments I5, I! for a purpose to bedescribed. The wall II forms with the walls I and 9, the two-screencompartments I9 and 2 I.

Openings 23 and 25 are formed in'the upper walls of compartments -l5 andI! respectively and these openings are 'closed by cover plates 21 and29.

The compartments I'9 and'2l are provided with openings 3|, 33 at the topto permit removal of 'thescreens. The openings are each provided with aninwardly extending peripheral flange 35, 39

respectively which is grooved to receive a gasket Hinged to the outeredges of the strainer case are doors '45, lzl which are adapted 1150close the openings 3|, 33 respectively. Each door has aprojectingmachined bead 34,35 which is adapted to rest upon the.associated gasket or 43 so as to seal the compartment. Each door isprovided with a suitable handle.

A plurality of pairs or .upstanding yokes v31, 38 are mounted on thecase adjacent the transverse edges of the doors, and the yokes areperforated 'at the upper ends to receive bolts 45. The latter also enterperforations in the ends of clamping bars 48 which aredisposedlongitudinally between the aligned pairs of yokes. Each bar 48has a plurality of screws 49 mounted therein which are adapted to engagethe associated door to hold the bead of the door firmly upon its gasketso that the screen compartment will be sealed.

The screws also serve to support the lid at spaced points against anypressures in the case to prevent distortion of the door which mightcause it to become unsealed.

Fixed to the side walls and bottom of the compartments l9 and 2|, as isshown particularly in Figures 1 and 2, are flanges 5|, 53 which areprovided with machined grooves '55, 51. Fixed to the doors, in alignmentwith the flange are gaskets 59, 6 I.

Each screen bank is provided at one end with a support plate 53 whichhas machined edges. These support plates enter the grooves 55 or 51,depending upon the compartment in which they are mounted, and the gasket59 or 61 contacts the upper edge of the uppermost plate. These plates,lying closely adjacent each other, form 'a substantial seal with eachother and with the grooves so that they establish a virtual bulkheadacross the compartment.

Referring now to Figures 4 and 5, which show the details of thelowermost screen bank, it will be seen that the .end plate163 isprovided with a circular hole 65 of sufficient diameter t receive thelarger screen 61 which has fixed to it a flange 69 which is held inplace on the plate by suitable fastenings 1|.

A rectangular frame 13 is provided at the end of the strainers oppositethe plate 63 and the strainers are fixed thereto by means of screws 15.In the case of the lowermost bank, the lower side of the strainer issupported by a spacer 11 instead of directly by the frame '13. A pair oflongitudinal straps 19 are disposed between the frame 13 and plate 63andserveboth as tension members to prevent the strainer being pulledapart and as handles for lifting a bank of screens from a compartment.

A perforated end plate 81 which is annular in ffl m 1588i, inthe end ofscreen 61 opposite flange 59 and is soldered or otherwise fixed inplace. A short tube 83 is fixed in said plate BI and extends into thescreen. Bolts 81 carry angle pieces 89 which have one leg parallel t theplate 8| and the other extending in the direction of the tube 83.

A second cylindrical strainer 9| having an internal diameter slightlygreater than the outside diameter of the tube 83 is fitted between thetube and the angle pieces 89. The inner strainer 9| is thus held inposition over the outlet tube 83. This strainer 9| is provided at itsother end with a perforated head 93 and a ball 95.

Referring now to Figures 1, 2 and 3, the wall I has an opening 91, andanother which is not shown, which connect the lower portion ofcompartment I with the lower portion of compartments I9 and 2|.Similarly, wall 9 has openings IOI and I03 which connect compartment I!with the strainer compartments.

An annular valve seat I05 is inserted in'each of the four openings andis held in place by fastenings I01. The seat may be adjusted by propershims if required.

A shaft I09 passe through the tube I3 and enters both compartments I5and I! where it has fixed to it, at each end, a pair of cross arms III,II3 which are pinned to the shaft in parallel relation. In thecompartment H, the shaft extends beyond the cross arm and carries a wormwheel II5.

The ends of the cross-arms are perforated as at H1 and in eachperforation i mounted a headed pin II9. A valve I2I in the shape of aflat, cupped disc, is provided with a hub I22 in which the end of pin H9is adapted to fit loosely so that the disc may tilt to a limited degreein any direction. A pin I23 enters an enlarged hole I25 in pin I I9 andpasses through the hub of the valve to hold the parts in theirrespective relations. The valve disc is provided with a groove I21 nearits outer periphery and a sealing ring I29, preferably of bronze orother suitable material, is fixed in the disc for cooperation with theseat I05.

A pair of bearings I3I are mounted on plate 9 adjacent worm wheel H5 anda shaft I33 passes through stufiing boxes I35 in the case I. IA. wormI3! is fixed to the shaft adjacent the wheel H5 and meshes therewithwhile a hand wheel I39 is fixed to drive the shaft.

Mounted in bearing blocks MI in compartment I! is a shaft I 43 which ispassed through the walls I of the case by stufi'ing boxes I45, and whichhas fixed to it an operating lever I4I. Cams I49, I5I are fixed to theshaft in position adjacent the headed'pins II9 when they are in thevalve closed position. When a valve occupies this position the cam I49,when rotated, will force the pin H9 toward the valve and the valve ringI29 against the seat I05 so as to eal off the port leading to the screencompartment.

A similar valve camming structure is provided in compartment I5, inwhich the shaft I5I is mounted in bearing block I53 and cam I 55actuates the pin II9. Stops I46 are provided for stopping the valves inclosing position.

Suitable drain plugs I51 may be provided if desired.

Operation If we assume that the valves are in the positions shown inFigures 1 and 3, it will be seen that the strainer chamber I 9 is sealedoff and that any liquid entering the compartment I 5 will pass intocompartment 2| where it will pass through the plates 63 and into theinterior of the large strainer 61 where the flow will be through thestrainer, into the compartment and out through the port I03 (Fig. 3).

There is also a path for liquid from the interior of strainer 61 throughstrainer 9 I, out through the short pipe 83, thence through port I03into I! and out. These flows are shown by arrows in Figure 4. By thedescribed construction of the strainers a greater strainer area issecured for a given cubic strainer compartment space than would beavailable if only a single screen were used.

If it becomes necessary to clean the compartment 2| and the screenstherein, the operator will first release the cams by rotating the twoshafts I 43, I5I. He will then rotate shaft I 33 by means of handwheelI39. The worm I31 and wheel II5 will rotate shaft I09 and both crossarms III, H3. This motion continues until the valve which is beinglowered into closing position strikes its stop I46. In this position thecompartment 2| will be closed off by the valves and compartment I9 willbe opened so that the liquid will flow through it.

The shafts I 43 and I5I will again be rotated to apply the cams to forcethe valves in sealing position on the valve seats of chamber I9.

The operator will next loosen the screws 49 bearing on the door 41,remove one of the bolts 46 in each bar 48, swing the bars about theremaining bolts out of the way of door 41 and then open the door. Thisopens the screen compartment so that by grasping the straps 19 on thescreen banks, the latter can be lifted out of the compartment. In orderto clean the screens, the operator withdraws the inner screen 9I bypulling on the bail so as to withdraw the other end from the tube 83 andangles 89. If necessary, the wing bolts 81 may be loosened. Removal ofstrainer 9| permits it to be scrubbed or otherwise cleaned and it alsogives access to the interior of strainer 3'! for cleaning.

When the screens and the compartment have been cleaned and the strainerbanks reassembled, the banks will again be inserted in the compartmentwhich is again closed, whereupon it is again ready for duty as soon asit becomes necessary to clean the compartment I9.

The strainers or screen are preferably made of .054 inch thick, coldrolled copper perforated with /e.2 inch holes staggered on inch centers.This will yield about 51 holes per square inch. If it is desired toreduce the size of the filtering openings, either the size of the holesin the perforated walls can be changed or a liner of screenwire havingsmaller holes can be placed inside the large strainer 61 and around theoutside of the small strainer 9 I. In this construction, the heavyscreen will serve to support the lighter screen against the flow ofliquid. 0 i

It is obvious, of course, that any suitable material other than coppermay be used for the strainers, depending upon the conditions under whichthe device is used.

It is obviou that various changes may be made in the form, structure andarrangement of parts Without departing from the spirit of the invention.Accordingly, applicant does not desire to be limited to the specificembodiment disclosed herein primarily for purposes of illustration; butinstead, he desires protection falling fairly within the scope of theappended claims.

What I claim to be new and desire to protect by Letters Patent of theUnited States is:

1-. In a strainer, the combination of a casing having means forming twostrainer compartments, strainer means comp-rising header plates and astrainer supported oneach plate, eachcomthrough the screens,

2. In a strainer, the combination of a'casi'ng having means forming twostrainer compart ments, strainer means comprising header plates disposedin vertical edgewise, abutting relation with each other, and a strainersupported on each plate, each compartment having an inlet and an outlet,a cover for each compartment, channels mounted on the bottom and sidesof said compartments to receive said screen header plates, sealing meansmounted on said cover adapted to engage the upper header plate, saidheader plates being disposed transversely across said compartments toform two chambers in each and preventingpassage of any substantialamount of liquid from one to the other except through the screens, valvemeans mounted at the inlet and outlet of said compartments and operablefor simultaneously opening or closing the inlet and outlet of acompartment, and means for op erating said valves.

3. In a strainer, the combination of means forming an inlet chamber, anoutlet chamber, and two strainer chambers disposed therebetween, eachstrainer chamber having valve ports opening into said inlet and outlet,chambers, valve means mounted in said inlet and outlet chambers,comprising a rotatable shaft, valves carried by said shaft and adaptedto be revolved thereby into position over one or the other of saidcorresponding ports, said inlet and outlet ports of one strainer chamberbeing disposed about said shaft in angularly spaced relation with thecorresponding ports of the other strainer chamber, means for rotatingsaid shaft from the exterior of said chamber, and means in said inletand outlet chambers operable from the exterior thereof for pressing saidvalves into sealing relation with said ports.

4. In a strainer, the combination of means forming an inlet chamber, anoutlet chamber and two strainer chambers, each strainer chamber having avalve port opening into each of said inlet and outlet chambers, valvemeans mounted in said inlet and outlet chambers, comprising a shaft,valves carried by said shaft and adapted to be revolved thereby intoposition over one or the other of said ports, said inlet and outletports of one strainer chamber being disposed about said shaft inangularly spaced relation with the corresponding ports of the otherchamber, and means for rotating said shaft from the exterior of saidstrainer, said valves being mounted for movement relative to said shafttoward and away from said ports, and means for seating said valves insealing relation on said ports.

5. In a strainer, the combination of means forming an inlet chamber, anoutlet chamber, and two strainer chamber-s, each strainer chamher havingan inlet and an outlet valve port therein provided with a valve seat, arotatable shaft, said inlet and outlet ports of one strainer chamberbeing di'sposedabout said shaft in angularly spaced relation with the:corresponding ports of the other chamber, means for rotating it at will,valve arms mounted on each end of said shaft; a valve mounted on eacharm for movement. toward and away from sealing engagement with a seat,said arms being arranged to revolve said valves into position over saidports, and-"means operable thereafter for forcing said positioned valvesinto sealing contact with said seats.

6. In a strainer, the combination of means forming'an' inlet chamber, anoutlet chamber and two strainer-chambers, ports connecting each of saidstrainer chambers with said inlet and outlet chambers, a: valve foreachport, a plurality of"arms=, means for supporting'said arms forrotation; said inlet and cutlet ports of one strainer chamber beingdisposed about said supporting means in angularly spaced relation withthe corresponding ports of the other strainer chamber, meansforsupporting said valves on said arms for rotation thereby into alignmentwith said ports comprising a headed pin passing through said arms,means: for rotating said arms to position the valves axial alignmentwith said ports, means mountinga valve on said pin for limited movementrelative thereto, and means for forcingsaid-pin and said valve intosealing relation over said port, said forcing means comprising a camacting upon the head of said in.

7. In a strainer, the combination of means forming an inlet chamber, anoutlet chamber and two strainer chambers, ports connecting each of saidstrainer chambers with said inlet and out let chambers, a valve for eachport, a plurality of arms, means for supporting said arms for rotation,said inlet and outlet ports of one strainer chamber being disposed aboutsaid supporting means in angularly spaced relation with thecorresponding ports of the other strainer chamber, means for supportingsaid valves on said arms for rotation thereby into alignment with saidports comprising a headed pin passing through said arms, means mountinga valve on said pin for limited movement relative thereto, and means forforcing said pin and said valve into sealing relation over said port,said forcing means comprising a cam disposed in alignment .with saidport and manual means for operating said cam.

8. In a strainer. the combination of meansforming an. inlet chamber, anoutlet chamber and two strainer chambers, each strainer chamber havingvalve ports opening into said inlet and outlet chambers; valve meansmounted in said inlet and outlet chambers, comprising a shaft, valvescarried by said shaft and adapted to be revolved thereby into positionover one or the other of said ports, said inlet and outlet ports of onestrainer chamber being disposed about said shaft in angularly spacedrelation with the corresponding ports of the other chamber, means forrotating said shaft from the exterior of said strainer, and stop meansfor positioning the valves over said ports.

9. In a strainer structure, means forming a chamber having an inlet andan outlet port, means forming a channel in the walls of said chamber ata point intermediate of said ports, a plurality of header plates adaptedto be slidably mounted in said channel to substantially seal off saidinlet from said outlet port, an opening in each plate, and strainersmounted on said plates over said openings.

10. In a strainer structure, means forming a chamber having an inlet andan outlet port, means forming a channel in the walls of said chamber ata point intermediate of said ports, a plurality of header plates adaptedto be mounted in said channel to substantially seal off said inlet fromsaid outlet port, openings in said plates, tubular strainers mounted atone end on said plates over said openings, and means extending from saidplates for supporting the other ends of said strainers.

11. In a strainer structure, means forming a chamber having an inlet andan outlet port, means forming a channel in the walls of said chamber ata point intermediate of said ports, a header plate adapted to be slidedgewise into said channel and to form a seal therewith, a lid for saidchamber, sealing means on said lid to engage the header and complete theseal-about it, means for holding said lid in place, an opening in saidheader plate and a strainer mounted oversaid opening.

12. In a strainer structure, means forming a chamber having an inlet andan outlet port, means forming a channel in the walls of said chamberbetween said ports, a plurality of header plates adapted to be mountedin said channel in sealing relation to it and to each other so as tosubstantially seal off said inlet from said outlet port, a plurality ofopenings in said plates, a plurality of tubular strainers mounted at oneend on said plates over said openings, means extending from said platesfor supporting the other ends of said strainers, said strainerscomprising heads which are adapted to close said other ends, tubes setin said heads, and additional tubular strainers fixed one to each ofsaid tubes and disposed within said first named strainers.

13. In a strainer structure, an outertubular strainer having an inletopening at one end and a head at the other end having an outlet opening, means for mounting a second tubular strainer on said head withinsaid first named strainer so as to discharge through said outletopening, said mounting means comprising a tube set in said head withwhich said second strainer is slidingly engaged, and removable clampingmeans for holding said second strainer on said tube.

14. In a strainer, the combination of a casing having means forming twostrainer compartments, a shaft disposed longitudinally of saidcompartments and carrying crcss arms at each end, means mounting saidshaft for rotation between two positions, a valve mounted at the end ofeach cross arm, inlet ports in said compartments disposed at one end ofsaid shaft and so as to be alternately covered by the valves carried bythe end of the shaft adjacent the inlet ports as the shaft occupies itstwo positions, outlet ports in said compartments disposed at the otherend of said shaft in alignment with their corresponding inlet ports, soas to be alternately covered by said valves carried by the correspondingend of the shaft as said shaft occupies its two positions, whereby onecompartment will be open and the other will be closed.

FRANK B. HARVUOT.

